About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2025
|
| Presentation Title |
K-19: Effect of Al Additions and Heat Treatment on the Microstructure and Mechanical Properties of Mg-9.5Li-0.5Zn Alloys |
| Author(s) |
Yong-Ho Kim, Hyo-Sang Yoo, Byeong-Kwon Lee, Eun-Chan Ko, Hyeon-Taek Son |
| On-Site Speaker (Planned) |
Yong-Ho Kim |
| Abstract Scope |
Magnesium alloys with added lithium are valued for their low density (1.4-1.6 g/cm³), making them suitable for electronics, aerospace, and defense. Lithium addition lowers the critical shear stress and c/a ratio of magnesium crystals, enhancing low-temperature formability. Mg-Li alloys' crystal structures vary with lithium content: a Mg-Li solid solution in a BCC structure (β-Li) above 10.3 wt.% lithium, and a dual α-Mg+β-Li structure at 5.7-10.3 wt.% lithium. However, embrittlement and mechanical property deterioration due to β-Li crystallization coarsening is a concern.
This study investigates Mg-9.5Li-0.5Zn alloys with varying Al content (0.5, 1, 1.5, 2 wt.%) and heat treatment. Specimens were gravity cast in an SF6+CO2 atmosphere and extruded at 250°C into 4 mm thick, 50 mm wide plates. Microstructure and phase analyses were conducted using optical microscopy, SEM, and X-ray diffraction, while tensile tests at room temperature assessed mechanical properties.
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| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Mechanical Properties, Other |